/* ═══════════════════════════════════════════════════════
   QUIZ ENGINE — shared styles for the `quiz` CPT.
   Merges the two structural variants found across all 25
   quiz pages onto one shared stylesheet:
     - "resource-card" variant (20 files, default)
     - "tabbed-guide" variant (5 files, upgraded design:
        view-switcher + Study Guide panel + optional
        hear-button on quiz feedback)
   Per-file topic strings/copy live in each page's PHP;
   only structural/presentational CSS lives here.
   ═══════════════════════════════════════════════════════ */

:root {
    --lg-green:     #22c55e;
    --lg-green-dk:  #16a34a;
    --lg-green-lt:  #f0fdf4;
    --lg-indigo:    #4f46e5;
    --lg-indigo-dk: #4338ca;
    --lg-indigo-lt: #e0e7ff;
    --lg-amber:     #f59e0b;
    --lg-amber-lt:  #fef3c7;
    --lg-red:       #ef4444;
    --lg-red-lt:    #fef2f2;
    --lg-bg:        #f8fafc;
    --lg-surface:   #ffffff;
    --lg-border:    #e2e8f0;
    --lg-border-hi: #cbd5e1;
    --lg-ink:       #0f172a;
    --lg-ink-2:     #475569;
    --lg-ink-3:     #94a3b8;
    --lg-radius:    12px;
    --lg-font:      'Sora', sans-serif;
    --lg-mono:      'JetBrains Mono', monospace;
}

/* ── Grid background ─────────────────────────────────── */
.si-grid-bg {
    position: fixed; inset: 0; pointer-events: none; z-index: 0;
    background-image:
        linear-gradient(rgba(79,70,229,.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(79,70,229,.035) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* ── Scoped font on activity wrap ────────────────────── */
.lejp-activity-wrap {
    font-family: var(--lg-font);
    color: var(--lg-ink);
    position: relative;
    z-index: 10;
}
.lejp-activity-wrap * { box-sizing: border-box; }

/* Tabbed-guide variant pages carry their own container sizing
   (pre-existing behavior in the 5 upgraded files, preserved
   verbatim rather than inheriting the sidebar-grid layout used
   by the 20 resource-card pages). */
.lejp-activity-wrap.lejp-quiz-tabbed {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* ── Dashboard navigation tabs (tabbed-guide variant only) ── */
.si-view-switcher {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
}
.si-switch-btn {
    flex: 1;
    padding: 14px;
    font-size: .95rem;
    font-weight: 700;
    border-radius: var(--lg-radius);
    cursor: pointer;
    font-family: var(--lg-font);
    border: 2px solid var(--lg-border);
    background: var(--lg-surface);
    color: var(--lg-ink-2);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}
.si-switch-btn.active {
    background: var(--lg-indigo);
    color: #fff;
    border-color: var(--lg-indigo-dk);
    box-shadow: 0 4px 12px rgba(79,70,229,0.2);
}

/* ── View panels (tabbed-guide variant only) ─────────── */
.si-panel { display: none; }
.si-panel.active { display: block; animation: siPanelFade 0.3s ease forwards; }
@keyframes siPanelFade { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ── Topbar: progress + stats ────────────────────────── */
.si-topbar {
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-radius: var(--lg-radius);
    padding: 10px 16px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
}
.si-progress-bar {
    flex: 1;
    height: 12px;
    background: var(--lg-border);
    border-radius: 20px;
    overflow: hidden;
}
.si-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--lg-amber);
    border-radius: 20px;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.si-stat-pill {
    padding: 5px 11px;
    background: var(--lg-border);
    border-radius: 20px;
    font-family: var(--lg-mono);
    font-size: 13px;
    font-weight: 700;
    white-space: nowrap;
    flex-shrink: 0;
}
#siScorePill { background: var(--lg-amber-lt); color: #b45309; }

/* ── Eyebrow label ───────────────────────────────────── */
.si-eyebrow {
    display: inline-block;
    padding: 4px 12px;
    background: var(--lg-indigo-lt);
    color: var(--lg-indigo);
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 10px;
}

/* ── Combo banner ────────────────────────────────────── */
.si-combo {
    display: none; align-items: center; justify-content: center; gap: 6px;
    padding: .45rem 1.1rem; border-radius: 100px;
    background: linear-gradient(135deg, var(--lg-amber), var(--lg-red));
    color: #fff; font-family: var(--lg-font);
    font-size: .82rem; font-weight: 800; margin-bottom: 1rem;
    animation: siComboIn .35s cubic-bezier(.34,1.56,.64,1);
}
.si-combo.active { display: flex; }
@keyframes siComboIn { from{transform:scale(.7);opacity:0} to{transform:scale(1);opacity:1} }

/* ── Resource cards (article / lesson / dialogue) ────── */
.si-resource-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 24px;
}

.si-resource-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 14px 16px;
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-bottom: 4px solid var(--lg-border-hi);
    border-radius: var(--lg-radius);
    text-decoration: none;
    transition: border-color .15s, background .15s, transform .1s;
    cursor: pointer;
}
.si-resource-card:hover {
    border-color: var(--lg-indigo);
    border-bottom-color: var(--lg-indigo-dk);
    background: var(--lg-indigo-lt);
    transform: translateY(-1px);
}
.si-resource-card:active { transform: translateY(2px); border-bottom-width: 2px; }

.si-resource-card__icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    line-height: 1;
    margin-top: 2px;
}
.si-resource-card__body { flex: 1; min-width: 0; }
.si-resource-card__label {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .06em;
    color: var(--lg-ink-3);
    margin-bottom: 3px;
}
.si-resource-card__title {
    font-size: .9rem;
    font-weight: 700;
    color: var(--lg-indigo);
    line-height: 1.35;
    margin-bottom: 3px;
}
.si-resource-card__sub {
    font-size: .78rem;
    color: var(--lg-ink-2);
    line-height: 1.45;
}
.si-resource-card__arrow {
    font-size: 1rem;
    color: var(--lg-indigo);
    flex-shrink: 0;
    align-self: center;
}

/* ── Question card ───────────────────────────────────── */
.si-card {
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-radius: var(--lg-radius);
    padding: 22px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.04);
    width: 100%;
    animation: siSlide .25s cubic-bezier(.4,0,.2,1) forwards;
}
@keyframes siSlide {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

.si-q-text {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--lg-ink);
    line-height: 1.45;
    margin: 0 0 8px;
}
.si-q-jp {
    font-size: .845rem;
    color: var(--lg-ink-2);
    font-weight: 600;
    margin: 0 0 18px;
    padding: 9px 13px;
    background: var(--lg-indigo-lt);
    border-left: 4px solid var(--lg-indigo);
    border-radius: 0 var(--lg-radius) var(--lg-radius) 0;
    line-height: 1.55;
}

/* ── Answer options ──────────────────────────────────── */
.si-opts { display: flex; flex-direction: column; gap: .6rem; }

.si-opt {
    width: 100%;
    padding: 13px 15px;
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-bottom: 4px solid var(--lg-border-hi);
    border-radius: var(--lg-radius);
    cursor: pointer;
    text-align: left;
    font-size: .925rem;
    font-family: var(--lg-font);
    font-weight: 500;
    color: var(--lg-ink);
    transition: border-color .12s, background .12s, transform .1s;
    display: flex;
    align-items: center;
    gap: .7rem;
    line-height: 1.45;
}
.si-opt:active:not(:disabled) { transform: translateY(3px); border-bottom-width: 2px; }
.si-opt:hover:not(:disabled)  { border-color: var(--lg-indigo); background: var(--lg-indigo-lt); }

.si-opt.is-correct {
    background: var(--lg-green-lt) !important;
    border-color: var(--lg-green) !important;
    border-bottom-color: var(--lg-green-dk) !important;
    color: var(--lg-green-dk);
    font-weight: 700;
}
.si-opt.is-wrong {
    background: var(--lg-red-lt) !important;
    border-color: var(--lg-red) !important;
    border-bottom-color: var(--lg-red) !important;
    color: var(--lg-red);
}

.si-opt__letter {
    min-width: 27px;
    height: 27px;
    border-radius: 50%;
    background: var(--lg-bg);
    border: 1.5px solid var(--lg-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: .75rem;
    font-weight: 900;
    font-family: var(--lg-mono);
    flex-shrink: 0;
    transition: background .12s, border-color .12s;
}
.si-opt.is-correct .si-opt__letter { background: var(--lg-green); border-color: var(--lg-green); color: #fff; }
.si-opt.is-wrong   .si-opt__letter { background: var(--lg-red);   border-color: var(--lg-red);   color: #fff; }

/* ── Feedback strip ──────────────────────────────────── */
.si-feedback {
    min-height: 44px;
    margin-top: 16px;
    padding: 11px 15px;
    border-radius: var(--lg-radius);
    font-size: .845rem;
    font-weight: 600;
    line-height: 1.55;
    display: none;
}
.si-feedback.is-visible   { display: block; }
.si-feedback--correct     { background: var(--lg-green-lt); border: 1px solid var(--lg-green); color: var(--lg-green-dk); }
.si-feedback--wrong       { background: var(--lg-red-lt);   border: 1px solid var(--lg-red);   color: var(--lg-red); }
.si-feedback__jp          { font-size: .78rem; opacity: .85; margin-top: 5px; font-weight: 500; }

/* ── Hear-it replay button (tabbed-guide/hear-button sub-variant) ── */
.si-hear-btn {
    display: inline-flex; align-items: center; gap: 4px;
    margin-left: 4px; padding: 3px 12px;
    font-family: var(--lg-font); font-size: .78rem; font-weight: 700;
    color: var(--lg-indigo); background: var(--lg-surface);
    border: 1.5px solid var(--lg-indigo); border-radius: 100px;
    cursor: pointer; vertical-align: middle; transition: all .12s;
}
.si-hear-btn:hover  { background: var(--lg-indigo); color: #fff; }
.si-hear-btn:active { transform: translateY(1px); }

/* ── Nav row ─────────────────────────────────────────── */
.si-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    gap: 12px;
}
.si-btn-skip {
    background: transparent;
    border: 2px solid var(--lg-border);
    padding: 10px 20px;
    font-size: .875rem;
    font-weight: 600;
    border-radius: var(--lg-radius);
    color: var(--lg-ink-2);
    cursor: pointer;
    font-family: var(--lg-font);
    transition: all .1s;
}
.si-btn-skip:hover { background: var(--lg-bg); border-color: var(--lg-border-hi); }

.si-btn-next {
    background: var(--lg-green);
    color: #fff;
    border: none;
    border-bottom: 4px solid var(--lg-green-dk);
    padding: 11px 28px;
    font-size: .9rem;
    font-weight: 700;
    border-radius: var(--lg-radius);
    cursor: pointer;
    font-family: var(--lg-font);
    transition: all .1s;
}
.si-btn-next:active:not(:disabled) { transform: translateY(3px); border-bottom-width: 1px; }
.si-btn-next:disabled {
    background: var(--lg-border);
    border-bottom-color: var(--lg-border-hi);
    color: var(--lg-ink-3);
    cursor: not-allowed;
    transform: none;
}

/* ── Score screen ────────────────────────────────────── */
.si-score-screen {
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-radius: var(--lg-radius);
    padding: 28px 22px;
    text-align: center;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.04);
    display: none;
    animation: siSlide .3s cubic-bezier(.4,0,.2,1) forwards;
}
.si-score-screen__emoji { font-size: 2.8rem; display: block; margin-bottom: 10px; }
.si-score-screen__title { font-size: 1.35rem; font-weight: 700; color: var(--lg-ink); margin-bottom: 4px; }
.si-score-screen__sub   { font-size: .875rem; color: var(--lg-ink-2); margin: 0 0 18px; }

.si-score-tiles {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
}
.si-score-tile {
    background: var(--lg-bg);
    border: 2px solid var(--lg-border);
    border-radius: var(--lg-radius);
    padding: 12px 16px;
    min-width: 76px;
}
.si-score-tile__num   { font-size: 1.6rem; font-family: var(--lg-mono); font-weight: 900; color: var(--lg-indigo); display: block; }
.si-score-tile__label { font-size: .68rem; color: var(--lg-ink-3); font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }

.si-completed-banner {
    display: flex;
    align-items: center;
    gap: 14px;
    background: var(--lg-green-lt);
    border: 2px solid var(--lg-green);
    border-radius: var(--lg-radius);
    padding: 16px 18px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}
.si-completed-banner__icon { font-size: 1.6rem; line-height: 1; }
.si-completed-banner__body { flex: 1; min-width: 200px; }
.si-completed-banner__title {
    font-weight: 700;
    color: var(--lg-green-dk);
    margin-bottom: 2px;
}
.si-completed-banner__sub {
    font-size: .85rem;
    color: var(--lg-ink-2);
    margin: 0;
}
.si-completed-banner__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}
.si-score-xp {
    display: inline-block;
    background: var(--lg-amber-lt);
    color: #b45309;
    border-radius: 20px;
    padding: 6px 16px;
    font-size: .845rem;
    font-family: var(--lg-mono);
    font-weight: 700;
    margin-bottom: 20px;
}
.si-score-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}
.si-btn-retry {
    background: transparent;
    border: 2px solid var(--lg-border);
    border-bottom: 4px solid var(--lg-border-hi);
    padding: 10px 20px;
    font-size: .875rem;
    font-weight: 700;
    border-radius: var(--lg-radius);
    color: var(--lg-ink-2);
    cursor: pointer;
    font-family: var(--lg-font);
    transition: all .1s;
}
.si-btn-retry:active { transform: translateY(2px); border-bottom-width: 2px; }
.si-btn-more {
    background: var(--lg-indigo);
    color: #fff;
    border: none;
    border-bottom: 4px solid var(--lg-indigo-dk);
    padding: 10px 20px;
    font-size: .875rem;
    font-weight: 700;
    border-radius: var(--lg-radius);
    cursor: pointer;
    font-family: var(--lg-font);
    text-decoration: none;
    display: inline-block;
    transition: all .1s;
}
.si-btn-more:active { transform: translateY(2px); border-bottom-width: 2px; }

/* ── Study guide panel (tabbed-guide variant only) ───── */
.si-guide-card {
    background: var(--lg-surface);
    border: 2px solid var(--lg-border);
    border-radius: var(--lg-radius);
    padding: 24px;
    margin-bottom: 24px;
}
.si-guide-card h2 { font-size: 1.4rem; color: var(--lg-indigo); margin-top: 0; border-bottom: 2px solid var(--lg-indigo-lt); padding-bottom: 8px; }
.si-guide-card h3 { font-size: 1.1rem; color: var(--lg-ink); margin: 18px 0 10px; }
.si-guide-card h4 { font-size: 1rem; color: var(--lg-ink-2); margin: 16px 0 8px; text-transform: uppercase; letter-spacing: 0.02em; }

/* Vocabulary grid block */
.si-vocab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-bottom: 16px; }
.si-vocab-item { background: var(--lg-bg); border: 1px solid var(--lg-border); padding: 12px 14px; border-radius: 8px; display: flex; flex-direction: column; gap: 4px; }
.si-vocab-en { font-family: var(--lg-mono); font-weight: 700; color: var(--lg-indigo); font-size: .95rem; }
.si-vocab-jp { font-size: .82rem; color: var(--lg-ink-2); font-weight: 600; }

/* Functional phrase items */
.si-phrase-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 16px; }
.si-phrase-item { background: var(--lg-bg); border-left: 4px solid var(--lg-indigo); padding: 12px 16px; border-radius: 0 8px 8px 0; }
.si-phrase-en { font-weight: 700; color: var(--lg-ink); font-size: .95rem; margin-bottom: 4px; }
.si-phrase-jp { font-size: .85rem; color: var(--lg-ink-2); }

/* Comparative styling cards (naturalness blocks) */
.si-compare-grid { display: grid; grid-template-columns: 1fr; gap: 12px; margin-bottom: 16px; }
@media (min-width: 640px) { .si-compare-grid { grid-template-columns: 1fr 1fr; } }
.si-compare-card { padding: 14px 16px; border-radius: var(--lg-radius); border: 2px solid var(--lg-border); position: relative; }
.si-compare-card--bad { background: var(--lg-red-lt); border-color: var(--lg-red); color: #991b1b; }
.si-compare-card--good { background: var(--lg-green-lt); border-color: var(--lg-green); color: #166534; }
.si-compare-badge { font-family: var(--lg-mono); font-size: 0.75rem; font-weight: 700; text-transform: uppercase; margin-bottom: 6px; display: block; }

/* Common error containers */
.si-mistake-block { background: var(--lg-bg); border: 2px solid var(--lg-border); border-left: 4px solid var(--lg-red); border-radius: var(--lg-radius); padding: 16px; margin-bottom: 16px; }
.si-mistake-title { font-weight: 700; color: var(--lg-ink); margin-bottom: 8px; font-size: 1.05rem; }

/* Dialogue flow container */
.si-dialogue-wrap { background: var(--lg-bg); border: 1px solid var(--lg-border); border-radius: var(--lg-radius); padding: 16px; margin-bottom: 16px; display: flex; flex-direction: column; gap: 12px; }
.si-line { display: flex; flex-direction: column; gap: 2px; padding-bottom: 8px; border-bottom: 1px dashed var(--lg-border); }
.si-line:last-child { border-bottom: none; padding-bottom: 0; }
.si-speaker { font-family: var(--lg-mono); font-weight: 700; color: var(--lg-indigo); font-size: 0.85rem; text-transform: uppercase; }
.si-text-en { font-weight: 600; color: var(--lg-ink); font-size: .95rem; }
.si-text-jp { font-size: .82rem; color: var(--lg-ink-2); }

/* Practice template rendering box */
.si-template-box { background: linear-gradient(135deg, var(--lg-indigo-lt), #f3e8ff); border: 2px dashed var(--lg-indigo); border-radius: var(--lg-radius); padding: 18px; font-size: .95rem; line-height: 1.6; color: var(--lg-ink); font-weight: 600; margin-bottom: 16px; }

/* ── XP toast ────────────────────────────────────────── */
.si-xp-toast {
    position: fixed; top: 18%; left: 50%; transform: translateX(-50%);
    background: var(--lg-amber); color: #fff; padding: 7px 15px; font-weight: 700;
    border-radius: 20px; box-shadow: 0 4px 12px rgba(245,158,11,0.4);
    z-index: 9999; pointer-events: none; font-family: var(--lg-mono); font-size: .9rem;
    animation: siToastUp 1.2s forwards;
}
@keyframes siToastUp {
    0%   { opacity: 0; transform: translate(-50%, 20px); }
    15%  { opacity: 1; transform: translate(-50%, 0); }
    80%  { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, -30px); }
}

@keyframes shake { 0%,100%{transform:translateX(0);}20%,60%{transform:translateX(-5px);}40%,80%{transform:translateX(5px);} }
.si-shake { animation: shake 0.35s ease-in-out; }

@media (max-width: 480px) {
    .si-score-tiles { gap: 8px; }
    .si-score-tile  { padding: 10px 12px; min-width: 68px; }
}